<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>循环的原理</title>
  </head>
  <body></body>
  <script>
    for (var i = 0; i < 10; i++) {
      console.log("我被执行了"); //执行了10次
    }

    for (let i = 0; i < 10; i++) {
      console.log("我被执行了");
      console.log(i);
    }
  </script>
</html>
